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Mum was 'screaming at' Alfie

Mr Lamb replied: "Quite bad, to be honest. If he tripped up she would drag him up."

The witness added she was also "screaming at him".

During the journey home, Mr Lamb said he kept his eyes on the road but heard Alfie "screaming".

He said: "I think I heard him say 'mummy' - just heard people telling him to shut up. Stephen - and Adrian told him once as well. Alfie did not be quiet and kept screaming."

Stephen Waterson denies manslaughter (Image: Twitter)

Hoare also "slapped Alfie around the head" in a bid to stop the noise, Mr Lamb said.

A short time before they reached Adams Way in Croydon, Alfie went quiet, the court heard.

Describing what happened when they arrived, Mr Lamb said: "He (Waterson) put his chair forward and asked Alfie to wake up and he did not respond so picked him up and he were not responding, and Adrian got out of the car.

"He kept telling Alfie to 'wake up, wake up, wake up', so he shook him a little bit to try to get him to respond.

"Adrian got out of the car and she started breaking down because Alfie was unresponsive.

Everything we know from the Alfie Lamb case

"Stephen called the ambulance. Stephen started speaking to them and he started CPR. Then he stopped giving CPR and passed the phone to me, and the ambulance man on the line was telling me how to do CPR because I never done it in my life."

During the desperate bid to save Alfie, Waterson walked off and went into his flat as Hoare was comforted by her friend Emilie Williams, who held the other young child in her arms.

Accused 'intimidated witness'

The witness said he had been disqualified from driving but Waterson "forced" him to get behind the wheel that day with "threats".

Both children had been put into the rear footwell after Waterson allegedly refused to allow child seats.

Mr Lamb told the court he knew Hoare through his uncle Richard, Alfie's father, and was dating Miss Williams, 19, who was also in the car.

Waterson is accused of intimidating Mr Lamb in the wake of Alfie's death.

Mr Lamb began to shake and appeared stricken when video found in Waterson's mobile phone was shown in court of him being attacked in a park.

In the footage, Mr Lamb appeared to scuffle with three men.

Alfie Lamb was crushed to death by an electric car seat, the Old Bailey heard (Image: Family Handout/PA Wire)

A voice could be heard shouting: "I will stamp on your face. Now talk.

"I will snap your jaw, Marcus. I'm a nasty piece of work.

"Stay on the floor. I will stamp in your head again."

Mr Lamb was heard to repeatedly plead: "Get off me."

He told the court Waterson was one of the men present and Hoare filmed it.